hi, i have this board, and it has 3 PCI Expres x1, as you can see it in the pictures, and regaring overclocking, using the Ctrl + F1 in bios will show alot more option for the extreme ocers, and AMD Overdrive will also show many options, and to the four way crossfire comment, Gigabyte's GA-MA790-DQ6 has four PCI Express 2.0 x16 @ x8 or two PCI Express 2.0 x16 @ 16x, DS5 board has more PCI Express x1 slots than DQ6